chore(package): update web3 to version 1.2.5

Closes #68

Author: greenkeeper[bot]

package.json

@@ -28,7 +28,7 @@
     "ganache-core": "2.5.5",
     "mocha": "5.1.1",
     "truffle-contract": "3.0.6",
-    "web3": "0.20.7"
+    "web3": "1.2.5"
   },
   "dependencies": {
     "@ethereum-alarm-clock/contracts": "1.0.0-rc.2",